Ditto the Tree Swallow pair; a purist might be put off by their being coaxed, trained, hoodwinked by that box. Not me. Except for cages, a nice bird is a nice bird.
"O sweet spontaneous" is one of the cummings poems I fell for in college, and I still like it. It's the best of both worlds; I don't have to admit to being a completely mindless sap in youth or a jaded, dessicated academic in the 21st century, too learned for such hormonal advocacy of the irrational.
O sweet spontaneous - A poem by e.e. cummings - American Poems